NONUNIFORM AIR-FLOW IN INLETS - THE EFFECT ON FILTER DEPOSITS IN THE FIBER SAMPLING CASSETTE

Smoke stream studies were combined with a new technique for visualizin g a filter deposit from samples used to monitor asbestos or other fibe rs. Results clearly show the effect of secondary flow vortices within the sampler under anisoaxial sampling conditions. The vortices observe d at low wind velocities occur when the inlet axis is situated at angl es between 45-degrees and 180-degrees to the motion of the surrounding air. It is demonstrated that the vortices can create a complex nonuni form pattern in the filter deposit, especially when combined with part icle settling or electrostatic interactions between the particles and the sampler. Inertial effects also may play a role in the deposit nonu niformity, as well as causing deposition on the cowl surfaces. Changes in the sampler, such as its placement, may reduce these biases. The e ffects noted are not likely to occur in all sampling situations, but m ay explain some reports of high variability on asbestos fiber filter s amples. The flow patterns observed in this study are applicable to str aight, thin-walled inlets. Although only compact particles were used, the air flow patterns and forces involved will have similar effects on fibers of the same aerodynamic diameter.